Last month, Jacob Sartorius shared a video on Instagram to express his gratitude in the spirit of Thanksgiving. And while the post was praised by fans of the Vine star, Grace VanderWaal decided to join the conversation to point out some flaws within the 15-year-old's message.

"Thankful," Jacob's note began. "Just a kid out here working my butt off, so glad I have you guys with me. I wouldn't be anywhere without you guys. Here's to 2018 being the biggest year yet!!"

As noted by the entertainment Twitter account PopCrave, Grace left a comment on Jacob's video to remind him that many other people have worked harder, suggesting that social media has helped him achieve his fame. She went on to explain: "No internet, no Spotify, no nothing that makes it so easy to gain so many fans in such little time. Just dedication and pure hard work, pushing and pushing to make their dreams happen." And Grace makes an important point; platforms such as YouTube and Vine have proven to turn "regular" people into overnight celebrities.

But Grace didn't stop there. She then went in, adding: "Lip syncing on an app and manipulating young girls' feelings is NOT 'working your butt off.'" Grace's comment ended on a positive note, but with a firm message. "You seem like a very great kid with a bright future ahead," she wrote. "I'd hate to witness a bright soul be smothered by being unaware. Please get or stay educated on those who came before you to understand and realize your blessings. Stay humble brother."

Her words resonated with some fans, who left comments thanking her for her honesty. Others, however, attacked the America's Got Talent winner, accusing her of "trying to bring [Jacob] down."